Instruction Manual
D200129X012
2506/2516 Receiver/Controller
June 2017
21
Table 5.Troubleshooting Chart (continued)
Fault Possible Cause Check Correction
4. Receiver/controller remains
at full or zero output pressure.
4.1 Supply or output pressure
gauge malfunction.
4.1 Insure the pressure gauges are
registering correctly.
4.1 Replace pressure gauges.
Use corrective action given for section 3
of this table.
4.2 Flapper adjustment. 4.2 Insure the flapper is not loose on
the torque tube shaft. Insure the
flapper is centered on the nozzle.
4.2 Replace or tighten flapper assembly
as necessary and/or center flapper on
nozzle.
4.3 Relay malfunction. 4.3 Check for relay malfunction by
using the testing relay deadband
procedure.
4.3 Depress plunger to clean out the
fixed restriction. Replace relay using the
procedure in the maintenance section.
Testing Relay Deadband
1. Replace the PROPORTIONAL BAND adjustment assembly with a 1/8 NPT pipe plug according to the sections for
changing proportional, reset, or anti‐reset windup valves.
2. Turn on the supply pressure and set it to 1.4 bar or 2.4 bar (20 or 35 psig) according to supply pressure
requirements of the receiver/controllers.
3. By changing the process variable and adjusting the INCREASE OUTPUT PRESSURE control, set the output pressure
to 15 or 30 psig. While monitoring the output pressure, slowly change the process until an output pressure change
just begins. Record the value of the process variable at this detection point.
4. Change the process variable in the opposite direction until another output pressure change just begins. Again,
record the value of the process variable. If the difference between the two values (the deadband) is more than 0.2
percent of the maximum displacer length, the relay must be repaired or replaced.
5. See the relay removal and replacement procedures and, if necessary, the relay disassembly and assembly
procedures if the relay is to be repaired.
6. Turn off the supply pressure, remove the pipe plug, and install the PROPORTIONAL BAND adjustment assembly.
Replacing Receiver/Controller Parts
See figure 14 for key number locations, unless otherwise indicated.
Bellows Replacement
Use the following bellows replacement procedure to replace defective bellows or change the output signal range.
Removal
1. Remove the relay tubing assembly (key 11), the INCREASE OUTPUT PRESSURE plate (key 35), and the attached
restriction plug orifice assembly (key 11).
2. Take out the four bellows screws (key 96). These are special screws with air passages in them so, be careful not to
lose them.
3. Compress the bellows (both are key 65) slightly and slip them out of the bellows frame (keys 133 or 134).
4. Unscrew the bellows from the beam (key 59). A gasket (key 79) fits between the end of the bellows and the bellows
frame.
5. Inspect each bellows and gasket and, if necessary, replace them.
Replacement
1. First install the bellows gasket (key 79), then install each bellows (key 59) by screwing it onto the beam (key 59).
2. Compress the bellows slightly and slip them into the bellows frame (key 133 or 134).
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